package edu.hawaii.duedates;

import com.meterware.httpunit.GetMethodWebRequest;
import com.meterware.httpunit.HttpUnitOptions;
import com.meterware.httpunit.WebConversation;
import com.meterware.httpunit.WebForm;
import com.meterware.httpunit.WebRequest;
import com.meterware.httpunit.WebResponse;
import com.meterware.httpunit.WebTable;

/**
 * UH Manoa Library information will be generated from this class. 
 * 
 * @author Ka Hung Phillip Lau
 * @author Creighton Okada
 *
 */
public class UhManoaLibrary {
  /**
   * Attempts to login to UH Manoa Library system.
   * 
   * @param id The UH user ID.
   * @param lastName The UH user's last name.
   * @return The WebConversation instance after successful login.
   * @throws Exception If login was not successful with these credentials.
   */
  private WebConversation loginToUhLibrary(String id, String lastName) throws Exception {
    String url = "http://uhmanoa.lib.hawaii.edu/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=pbLogon";
    // UH Library Website has bogus JavaScript code.
    HttpUnitOptions.setExceptionsThrownOnScriptError(false);
    // create the conversation object which will maintain state for us
    WebConversation conversation = new WebConversation();
    WebRequest request = new GetMethodWebRequest(url);
    WebResponse response = conversation.getResponse(request);
    WebForm form = response.getFormWithName("logonpage");
    form.setParameter("BC", id);
    form.setParameter("LN", lastName);
    form.submit();
    response = conversation.getCurrentPage();
    if (response.getText().contains(
        "Sorry, Login unsuccessful.  Username and/or password" + " is not correct")) {
      throw new Exception("Error while logging in to UH Library");
    }
    return conversation;
  }

  /**
   * Given a logged in user to the UH Library site, provides info about their library books.
   * 
   * @param id The UH user ID.
   * @param lastName The UH user's last name.
   * @return A String containing information about their books.
   * @throws Exception If problems occur parsing the site pages.
   */
  public String getUhInfo(String id, String lastName) throws Exception {
    String uhSiteNoItemString = "You have no items checked out.";
    String bookResults = null;
    try {
      WebConversation conversation = this.loginToUhLibrary(id, lastName);
      WebResponse response = conversation.getCurrentPage();
      WebForm form = response.getForms()[0];
      if (uhSiteNoItemString.equals(form.getText())) {
        return "No items checked out";
      }
      else {

        WebTable table = response.getTables()[0];

        if (table.getText().contains("Block Reason")) {
          try {
            WebTable table2 = response.getTables()[1];

            if ((table2.getText().contains("Checked Out: Due"))) {
              for (int a = 0; a < table2.getRowCount(); a++) {
                bookResults = table2.getCellAsText(a, 3) + " -- " + table2.getCellAsText(a, 1)
                    + "\n\n";
              }
              return bookResults;
            }
          }
          catch (Exception e) {
            System.out.println("No items checked out");
          }
        }
        else if (table.getText().contains("Checked Out: Due")) {
          for (int c = 0; c < table.getRowCount(); c++) {
            bookResults = table.getCellAsText(c, 3) + " -- " + table.getCellAsText(c, 1) + "\n\n";
          }
          return bookResults;
        }
      }
    }
    catch (Exception e) {
      throw new Exception("Error getting UH Book info", e);
    }
    return uhSiteNoItemString;
  }
}
